Choji Ochiai

Choji Ochiai, often referred to as Otcho or Shogun, is one of the main protagonists and Kenji's best friend. He was the co-leader of Kenji's Youth Group (being the one who created their 'symbol of friendship') and of Kenji's Group.

When he was 27, he left his family after the loss of his son and went to India. There he met with a monk who taught him how to be strong. In Thailand, he blew up the Rainbow Kid factory, which produced a drug created by Friend. After a phone call by Kenji, Otcho returned to Japan in 2000 to fight Friend. He was captured after Bloody New Year's Eve and put into prison. In 2014, he broke out with the mangaka Kakuta and searched for Kanna.

As a child, Otcho was intelligent and a good student, thus achieving high scores in school; he seems to also be from a relatively well off (or at the least a financially stable) family, as he was able to afford attending the 1970 World Expo in Osaka with relative ease and is shown being asked for spare change several times. As a result, he spent his childhood as a rather calmly contained and self-assured individual. This is further displayed in many instances where he is visibly more difficult to unnerve than his peers. While Otcho is strangely credited in several occassions as the leader of Kenji's friendship group, he acts more as an advisor of Kenji's than a leader, listening first before providing information and various insights that greatly influences final decisions on many occasions.

As Shogun in 2000, Otcho vaguely resembles Martin from Urasawa's preceding manga Monster, especially given their residue facial hair and the extents they are willing to go for the less fortunate women they care about.